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z80.net's Introduction

ZX Spectrum 48K-128K emulator

Simple .net core implementation of Z80 CPU emulator, ULA/AY chip and .Z80/.TAP file format reader. UI is implemented using cross-platform Avalonia library.

Features:

  • Runs both under windows and linux
  • Can load and play z80 v1 and v2 format apps
  • Can play TAP files
  • Processor and ULA emulation not coupled with UI
  • Clock cycles are emulated, not affected by real time - supports single-frame stepping
  • Instruction timing according to specs
  • Passes zexdoc and zexall tests
  • Capable of running at 1K FPS
  • Contains reader of zx spectrum floating point format

Bugs and limitations:

  • Ubuntu version doesn't react on keydown events
  • Sound output supported only on win32
  • No joystick support
  • AF register undocumented bits 3 and 5 behavior is not completely implemented
  • Non-maskable interrupts are not supported
  • Output tv signal is done line-by-line instead of pixel-by-pixel, so some game effects look invalid
  • Contended memory emulation is not implemented
  • R register increment is simplified and based only on instruction size

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